Multiple Choice
Lenses are usually coated with
A) magnesium fluoride
B) sodium fluoride
C) zinc fluorite
D) none of these
Correct Answer:

Verified
Correct Answer:
Verified
Q1: The Camera Obscura was first recorded in<br>A)400bc<br>B)1600
Q2: _ has been defined as taking of
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Q4: Which of the following parts of the
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